说明：我这个纯粹是为了学习和记忆，对过程不做完整说明。
1.浏览器请求
http://localhost:8080/HelloForm?first_name=zhang&last_name=Li
2.命令解析
<servlet>
<servlet-name>HelloForm</servlet-name>
<servlet-class>HelloForm</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloForm</servlet-name>
<url-pattern>/HelloForm</url-pattern>
</servlet-mapping>
3.命令处理
知识要点：如何识别浏览器传过来的数据是啥。
request.getParameter(“first_name”)
// 导入必需的 java 库
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
// 扩展 HttpServlet 类
public class HelloForm extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
// 设置响应内容类型
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "使用 GET 方法读取表单数据";
String docType =
"<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
out.println(docType +
"<html>\n" +
"<head><title>" + title + "</title></head>\n" +
"<body bgcolor=\"#f0f0f0\">\n" +
"<h1 align=\"center\">" + title + "</h1>\n" +
"<ul>\n" +
" <li><b>名字</b>："
+ request.getParameter("first_name") + "\n" +
" <li><b>姓氏</b>："
+ request.getParameter("last_name") + "\n" +
"</ul>\n" +
"</body></html>");
}
}
4.运行效果
使用 GET 方法读取表单数据
名字：ZARA
姓氏：ALI